On May 26, 2010, at 8:09 AM, Michael Thomas wrote: > On 05/26/2010 07:48 AM, Steve Atkins wrote: >>>> Perhaps I missed something, but if domain B is rejecting email from the >>>> list Authored by A, then won't that cause a list member at domain B to be >>>> removed from the list as well? I think that is what John meant by innocent >>>> bystander. Most MLM remove subscribers after repeated bounces. I don't >>>> know if they are smart enough to look into why the message bounced. >> >> That's exactly the issue, and not a theoretical one. >> >> However, domain B is not an innocent bystander, as they intentionally >> configured their mail system to reject mail it shouldn't, and the recipients >> at domain B support that decision, on some level. > > Wait a minute. There's nothing wrong with discarding something set to > discardable (cf, "shouldn't").
Yup. They didn't do that, though. > Or are you saying that it shouldn't produce a bounce/5xx and just silently > discard it? Exactly. If they would otherwise deliver the mail, and the reason they decided not to was because of a combination of an ADSP-discardable record and the lack of a DKIM signature then they should silently discard the mail. (If you're about to reject or bounce a mail for some other reason and happen to notice that it's discardable mail that's a quite different issue, and one we've not really talked about.) Cheers, Steve _______________________________________________ NOTE WELL: This list operates according to http://mipassoc.org/dkim/ietf-list-rules.html
